Hi
Take it this way , you want to repair equipment (PM), you need spares but these are in stores or have to be bought , that means when you specify your components in PM order for it to generate a requisition or reservation you are integrating with MM(inventory and procurement), if those spare parts are bought they need to be paid for , definitely you need a G/L account (FI) and for settlement of costs incurred you now integrate with CO. you may think of the same for other modules.
regards
TC
